Michael played a pivotal but oftentimes controversial role in building Uber into the $69 billion ride-hailing giant it is today.

As one of Uber CEO Travis Kalanick's closest confidants, Michael oversaw Uber's broader business strategy, including partnerships and fundraising. He has been with Uber since 2013 and currently holds the title of chief business officer.

Michael's rumored resignation comes amid an investigation into Uber's work culture, including several scandals in which Michael was known to have a direct role in.

The results of the months-long investigation into Uber's workplace, being led by former attorney general Eric Holder, are being discussed by Uber's board members in an emergency meeting on Sunday morning in Los Angeles. As part of the meeting, Reuters reported that there will be a discussion on whether or not Uber's CEO should consider a temporary leave of absence from the company as well.